There are chances to increase the Criminality rate, as the BTC settles down the payment with anonymous behavior. It does the Peer to Peer settlement, but we cannot track the address or other information of the parties involved here. This BTC payment system is used to buy and sell Arms & Ammunition, dangerous Weapons, Illegal Drugs, and also for the other terrorist funding activities. And that is the reason many countries are banning them and they will make them legal in their country with proper management and plan them with strong regulations.